Quantum computer simulates particle creation in 1D Ising
Researchers have used a 104-qubit quantum processor to simulate the inelastic production of a heavier particle from a collision of two light particles in a
A team of researchers has reported evidence for inelastic particle production using a digital quantum processor. They simulated a collision within a one-dimensional Ising field theory, observing the creation of a heavier particle from the energy of two colliding lighter ones.
According to the study published in Nature Physics, the experiment used 104 qubits and up to 5,589 two-qubit gates to access the post-collision dynamics. The researchers collided two wavepackets, each containing the lightest particle in the theory. They then used the skewness of the measured energy density to identify an inelastic scattering component containing one outgoing light particle and one heavier particle.
A new algorithm for wavepacket preparation
The computation relied on a quantum algorithm that extends protocols for efficiently creating W states. These are multipartite entangled states with a single excitation distributed across many qubits. The new method uses mid-circuit measurements followed by operations conditioned on their outcomes. This makes the circuit depth for preparing the initial wavepackets independent of the wavepacket's spatial volume. Previous methods required circuit depths that scaled polynomially with volume.
The authors state that this approach enables the preparation of wavepackets for studying scattering in various quantum field theories. They explicitly constructed wavepacket-preparation circuits for one-dimensional Ising and scalar field theories, the Schwinger model, and two-dimensional Ising field theory.
The challenge of simulating high-energy physics
High-energy particle collisions can convert energy into matter through the inelastic production of new particles. Quantum computers offer a potential route to simulating these out-of-equilibrium processes, which are notoriously difficult for classical computers. However, accessing the detailed post-collision dynamics and determining the abundance of produced particles has remained a significant challenge.
The research team's work, as described in the source, represents a step toward using quantum processors to tackle these problems. The experiment specifically probed a scattering process in a simplified, one-dimensional model of a quantum field theory.
Technical specifications of the quantum simulation
The source provides key figures on the scale of the quantum computation performed. The following table summarizes the resources used in the experiment.
| Resource | Quantity |
|---|---|
| Qubits used | 104 |
| Maximum two-qubit gates | 5,589 |
The study's authors note that the processed data supporting the experimental findings are included in a supplementary section. The remaining raw datasets are available from the corresponding author upon reasonable request.
The research builds upon a long-standing vision for quantum simulation, citing foundational work by Feynman and others. It connects directly to ongoing efforts within the high-energy physics community to use quantum technologies for simulating lattice gauge theories and fundamental forces. The successful demonstration of inelastic scattering opens a path for future digital quantum simulations of more complex field theories and collision processes.
